SiO2 Induces Iron Overload and Ferroptosis in Cardiomyocytes in a Silicosis Mouse Model
Biomedical and environmental sciences : BES(2024)
Abstract
Objective
The aim of this study was to explore the role and mechanism of ferroptosis in SiO2-induced cardiac injury using a mouse model.
Methods
Male C57BL/6 mice were intratracheally instilled with SiO2 to create a silicosis model. Ferrostatin-1 (Fer-1) and deferoxamine (DFO) were used to suppress ferroptosis. Serum biomarkers, oxidative stress markers, histopathology, iron content, and the expression of ferroptosis-related proteins were assessed.
Results
SiO2 altered serum cardiac injury biomarkers, oxidative stress, iron accumulation, and ferroptosis markers in myocardial tissue. Fer-1 and DFO reduced lipid peroxidation and iron overload, and alleviated SiO2-induced mitochondrial damage and myocardial injury. SiO2 inhibited Nuclear factor erythroid 2-related factor 2 (Nrf2) and its downstream antioxidant genes, while Fer-1 more potently reactivated Nrf2 compared to DFO.
Conclusion
Iron overload-induced ferroptosis contributes to SiO2-induced cardiac injury. Targeting ferroptosis by reducing iron accumulation or inhibiting lipid peroxidation protects against SiO2 cardiotoxicity, potentially via modulation of the Nrf2 pathway.
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Key words
SiO2 exposure,Iron overload,Ferroptosis,Cardiac injury,Nrf2
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